i have a 93 civic w/ a Poor man type r and the problem is that the idle suges from 1100 to 1500 when its fully warmed up, i found out today that if i havew the heat set on 3-4 the idling stops. if i take the heat down to 1-2 or even off it surges. i have already checked the vacuum hoses and did the collant bleeding. its weird i have never heard of the motor stop surging when the heat is turned on high. i have tested it many time with the same result, when the heat is on low or off it idles and when its set on high it goes away immedialty. please help, thanks

 

what mods you have on it?

 

i have ITR IM, high compression
but the probelm is that my old B16 did the same thing

 

up

 

bump

 

Nah, i wouldnt know man. Sorry. All i can think of is maybe just try messing with the TB bolt. It stopped my car from fluxuating idle after switching to OBDI ecu.

 

IACV? the heat thing is strange...makes me lean towards bleeding the coolant again, i dont know why...but thats about the only way i can relate the two.

 

Strange.... I would check all the grounds first, especially the thermostat ground.

This thread may also be helpful --> https://honda-tech.com/zero...65905

Good luck

 

thanks ill have to try some of those